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Thinking of Herveys' headers and fabricating an efficient muffler set up that is not terribly loud. Is the CatBack worth it? Thoughts:????

I like Hervey's headers, though if you're using headers, then you're doing much more than a mere cat-back setup. Also, if you're going that custom, then there's really no benefit/reason for leaving a catalytic converter in the system, unless you need at least an el-fako one for emissions/inspection purposes.